Level Crossing Analysis of the I-GALFA H I 21-cm Line Maps of the Galaxy

Details Level Crossing Analysis of the I-GALFA H I 21-cm Line Maps of the Galaxy Level Crossing Analysis of the I-GALFA H I 21-cm Line Maps of the Galaxy

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812902p&link_type=abstract

American Astronomical Society, AAS Meeting #218, #129.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Statistics

Scientific paper

Recent high-resolution observations reveal that the HI structure of the Galaxy is quite complex with numerous filaments and clumps. Statistical techniques are essential to describe and compare these complex morphologies, which can give insights on how the energy is injected and dissipated in the interstellar medium. We use the level-crossing statistics (LCS) to examine the HI structure in the I-GALFA HI survey data. The LCS is complimentary to the genus statistics. Like the Genus, the LCS can discriminate specific topologies such as clumpy or hole-like field, but in addition it can describe aligned or filamentary structures. The I-GALFA HI survey covers the first quadrant of the Galaxy including significant latitude range (about 12 degree up and down the plane) with high resolution (about 3.35 arcmin), so that it provides a great opportunity to observe the fine details of HI both in the inner and outer Galaxy. We select sample regions of spiral arms in the inner and outer Galaxy and derive their LCS properties. The LCS curves of most areas show positive tails and large skewnesses, which implies that the HI morphology is significantly clumpy. In the outer spiral arm, the LCS curves in longitude and latitude directions show considerable difference and indicate that the HI gases are aligned along the Galactic plane. This appears to be consistent with the low stellar activity in the outer Galaxy. We will also present the LCS properties with varying spatial scales.

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